Break two classes defined in json_value_serializer.cc, .h into separate files.

chrome/test/perf/dromaeo_benchmark_uitest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
-#include "base/json/json_value_serializer.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/perf/perf_test.h"
 #include "chrome/test/ui/javascript_test_util.h"
@@ skipping 138 matching lines @@
 
 TEST_F(DromaeoReferenceTest, JSLibPerf) {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(kRunDromaeo))
     return;
 
   RunTest("jslib");
 }
 
 
 }  // namespace